Door-lock



(Model.) -V

"0; E. PILLA'RD. Doon Loox.

Patented Feb. 6, 1883.

`Uivrrsn STATES Aram* Friese DOOR- LOCK.

SPECIFICATION forming part of Letters Patent No. 271,918, dated February 6, 1883.

Application filed July 18, 1882. (Model.)

To all whom it may concern:

Be it known that I, OLIVER E. PILLARD, of Cambridgeport, county of Middlesex, State of Massachusetts, have invented an Improvement in Locks, of which the following description, in connection with the accompanying drawings, is a specification. 1

My invention relates to that class ot' locks inwhich the bolt, havingv been drawn into and then thrown out from the case by the regular key, cannot be again drawn into t-he oase to unlock the lock until after a master-key has been inserted to place in correct position an extensible toothed tumbler controlled only by the said master-key, the said tumbler acting, until set by" the master-key, to prevent the drawing ot the bolt into the case, the bolt having a registering-pin which is arrested by the said extensible toothed tumbler.

Figurel represents in side elevation, with the cover-plate removed, a lock embodying my invention, the extensible toothed tumbler having been set by the masterkey 5 Fig. 2, the said cover separately. Fig. 3 shows the lock with all the tumblers removed. Fig. 4 represents the master-key of the lock; Fig. 5, the regular key of the lock. Fig. 6 represents in full lines a detail showing the extensible toothed tumbler in the position in which it will be left when the bolt has been thrown out from the case by the regular key, and in dotted lines the position into which the said tumbler is put by the master-key before the lock is to be unlocked or the -bolt drawn into thel case by the regular key Fig. 7, a detail of the key receiving socketpiece, and Fig. 8 details of the extensible toothed tumbler.

The ease A of the look has a bolt, B, (fully shown in Fig. 3,) provided at one side with a `registeringpin, a, fast upon it, the said registering-pin having its inner edge made V-shaped, to at certain times and under certain contingencies meet the toothed end 5 of a toothed tumbler, b, and `arrest the motion of the said bolt-as, for instance, when it is attempted to draw the bolt B into the case by the wrong key or bythe regular key before the masterkey has been inserted to set the toothed tumbler. The bolt has shoulders 0c', (see Fig. 3,) which are struck by the bolt-movin g projection `c2, forming part of the keyreceiving socketpiece c3, (shown separately in Fig. 7,) one end ot' which takes a bearing in the lock-case and its other end in the hollow hub-piece c4 of the removable cover A2 of the case. The socketpiece c3 has a long slot, 2, to receive the keys by which it is partially rotated. The bolt B, at its rear end, is guided by a stud, d, connect ed with the case A, and this stud serves as the fulcrum for all the main tumblers e, two or more, and the extensible toothedy tuin bler'b, each of the said tumblers having a spring, 3, which normally keeps it pressed down against the tumbler-stop d2.

The lock herein shown is supposed to have four tumblers such as shown by e, and the Vtoothed tumbler b,the latter occupying a position in the stack of tumblers next the outer tumbler e, three other tumblers like c being supposed to be below tumbler bin Fig. 1. The tumblers b e each have a like slot, 4,`andV before the bolt B can be drawn into the case to unlock the lock all these slots 4 must be in line with the registering-pin a ot' the said bolt.

The regular key is marked j' and the inaster-key g, each having notches and projections of suitable shape to perform its proper duty with the tumblers. The extensible toothed tumbler, (see Figs. 6 and 8,) as herein shown, is composed ot an end piece, 10, pro vided with Va slot, l2, and a space, 13,V and va plate, 14,

toothed at 5, slotted at 4, and provided with an arm, 15, having a head, 16, to enter the slot 12 and space 13 and slide therein for a short distance, thesaid tumbler being thus made to slide longitudinally, or being extensible. When the bolt is drawn into the case by the regular key f the registering-pin ct meets the inner end ot" the slot 4 of the plate 14 ot' the extensible toothed tumbler and causes the arm 15 and head 16 to be moved back into the piece 10, as in full lines, Fig. 6; but when the regularkey is turned in the opposite `direction, as it is before it is withdrawn to throw the bolt B out from the case, the toothed tumbler b, as soon as the pin a passes out of slot4 in it, is acted upon by its spring, the edge ot' 'the said tumbler b entering the deep out 7 in the key. Fig. 6 shows the position of the toothed tumbler after the bolt B has been thrown out by the regular key and the lock locked. Now, before the bolt can he drawn in by the regular key j the master-key g must be inserted into the socket-piece c3 and turned,

roor

2 amers when the projection 8 of the said master-key acts on the lower edge of the plate 14 of the extensible toothed tumbler and turns it on the stud d, places the slot 4 therein opposite the pin a, and as the projection 8 is passing the corner 18 of the said plate the strain thereon is sufficient to push the said plate toward the left, as in dotted lines, Fig. 6, just far enough to place the slotted part 4 on the pin a, as in Fig. 1, which sets the toothed tumbler, so that the regular key f may operate correctly when placed in the socket-piece and turned. The notches and projections of the master-key are not of proper shape to turn the tumblers c into position to place their slots 4 in line with pin a, so that the master-key cannot alone draw the bolt B into the case. The extensible toothed tumbler having been set as in Fig. 1, the regular key 5 may be inserted to turn the tumblers e and bring their slots 4 all in line with the pin a, after which the part 02 of the socket-piece c3 strikes the shoulder c and draws the bolt in; but, as before described, as the key and socket-piece are turned in the opposite direction to throw the bolt B out of the case the toothed tumbler drops, so that it cannot be again lifted by the regular key. Should a key not the master key be inserted just after the regular key was withdrawn, a projection on the said key, which should lift the toothed tumbler, if of greater or less length than the projection 8. of the master-key, would operate on the corner 18 and move the plate 14 outward out of its time, so that instead ot' the slot 4 being engaged by the pin, as before described, some one of the teeth at the edge of the plate of the toothed tumbler would be thrown into engagement with or opposite the pin a, and the bolt B could not be drawn into the case.

From the foregoingdescriptionit will beseen that the toothed tumbler b is directly under the control of the master-key, while the other tumblers, e, are directly under the control ofthe regular key, and, so far as I am aware, this is the first lock wherein a master-key operates a toothed rather than a plain tumbler. It' the tumbler controlled by the master-key were not toothed, it could be readily set without the aid of a master-key, and such an untoothed tumbler, having only the notch 4, could be easily set on the registering-pin. By providing this master-key tumbler b with teeth, it will be seen that as soon as the said tumbler is acted upon by any device inserted in the slot 2, or the said tumbler is in anyway moved ment of the toothed end of the tumbler b upon the edge of the said registering pin or stump, and will lock the said toothed tumbler. The

tumbler b having been set wrongly by other than the master-key, the regular keyf must be inserted to move the part 14 of tumbler b back,

as in full lines, Fig. 6, when it will drop, as

therein shown, as the regular key is being taken out, and thereafter the said toothed tum-y bler may be set correctly by the master-key.

Ido not broadly claim a lock adapted to be operated by two keys inserted one after the other in the same slot, one key operating a latch provided with a stop and adapted to be {')eciprocated in the case at right angles to the olt. v

rEhe part 15 is held securely in the slot of the piece 10 by the pressure against the eX- tcnsible tumbler at each side of one of the tumblers c e.

l claim- 1. In a lock, the bolt B, having the registering pin or stump, combined with the extensible toothed tumbler to co-operate therewith, substantially as described.

2. The case, boltB,provided with registeringpin or stump and the slotted socket-piece provided with projection c2, combined with the series of tumblers e and the extensible toothed tumbler b, each ot' the vsaid tumblers being provided with a slot, 4, the combination being substantially as described, whereby the tumbler b maybe set by a master-key, and the OLIVER E. PILLARD.

Witnesses G. W. GREGORY, W. H. SIGs'roN.

IOO 

